Noise and vibration control in Noise and vibration control in

(1)

Noise and vibration control in Noise and vibration control in

multiplex cinemas multiplex cinemas

A. Farina

¹

; P. Fausti

²

1

Department of Industrial Engineering, University of Parma, Italy

2

Department of Engineering,

University of Ferrara, Italy

(2)

Topics Topics

z Design and realization of a new multiplex cinema in Genoa

z Severe environamental conditions (industrial and trainway noise and

vibrations, close to airport and docks)

z Strict specification in terms of acoustical

and vibration control set by the customer

(3)

Overview Overview

Site for the

construction of the

multiplex cinema

(4)

Overview Overview

Site for the

construction of the

multiplex cinema

(5)

Plan Plan

multiplex cinema

(6)

Detailed

Detailed Plan Plan

4

14 1 2 3 5 6 4

10 11 13 12 8 9 7

10

2 3 4 5

16 17 18 19 20 1

15 12 13 14 11

6 7 8 9

3 4 6 7 8 9 5 2 1 2 3 1

4

14 1 2 3 5 6 4

10 11 13 12 8 9 7

10

2 3 4 5

16 17 18 19 20 1

15 12 13 14 11

6 7 8 9

3 4 6 7 8 9 5 2 1 2 3 1

11

1234322

3

4

4567

9 121110 181716151413

9101112 1089

7653214 1234 8765

2345678

1

11 4322341098 77 98891

16

2

15 13 11 12 10 13 12 11 10 14

4

5

6 3 5634

5643 12

12

7

16 15

19 3 2 1

12 13 14 12 13 14

18 17 16 15 2 3 1 1 3 2

11 10 9 8 5 6 7 4 4 5

8 7 6

10 9 11

6 5 4

7 7

9

8 8

9

1 16

2 15 13 11 12 10

13 12 11 10

14

4 5 6

3 5 6 3 4 5 6 4 3 1 2 1 2

7

16 15 19

3 2 1

12 13 14 12 13 14 18 17 16 15

2 3 1 1 3 2 11 10 9 8

5 6 7

4 4 5 8 7 6 10 9 11

6 5 4 16 15

19 3 2 1

12 13 14 12 13 14

18 17 16 15 2 3 1 1 3 2

11 10 9 8 5 6 7 4 4 5

8 7 6

10 9 11

6 5 4

CI PIOVE

schermo di proiezione

TERRAZZA HOLLYWOOD

CAFE'

CI PIOVE

H=3.00

H=3.00 H=3.50

H=6.30

H=3.50 H=6.30

3.50

10.10

16.55

15.85 10.10

16.55 16.55

H=2.40

16.55 H=3.50

H=3.50

16.65 16.55

16.55 16.55 H=3.50

15.65 15.55

H=3.50

H=2.40 H=2.40

16.65 16.65 16.65

(7)

Significant

Significant Numbers Numbers

z 5 floors: 2 parking, 1 commercial, 1 cinema, 1 technical

z 14 cinema rooms, 4980 m

²

z 1 x 499 seats, 6x216 seats, 5x143 seats, 2x322 seats = 3154 total seats

z Entrance and services 2838 m

²

z Shops and restaurants: 9500 m

²

z 18800 m

²

parking area (2 floors), 720 cars

(8)

Acoustical

Acoustical specifications specifications (UCI) (UCI)

z

External walls R’w = 55 dB

z

Internal walls R’w = 50 dB

z

Fire-resistant walls R’w = 55 dB

z

Wall between cinema rooms R’w = 65 dB

z

Roof R’w = 50 dB

z

Floor R’w = 60 dB

z

Internal doors R’w = 45 dB

z

Wall of the projection room R’w = 50 dB

Apparent Sound Reduction Index

(ISO-140/4, ISO-717)

(9)

Acoustical

Acoustical specif specif . ( . ( Italian Italian Law Law ) )

z

External walls R’w = 42 dB

z

Internal walls R’w = 50 dB

z

Fire-resistant walls R’w = 50 dB

z

Wall between cinema rooms R’w = 50 dB

z

Roof R’w = 42 dB

z

Floor R’w = 50 dB

z

Internal doors ---

z

Wall of the projection room ---

Apparent Sound Reduction Index

(ISO-140/4, ISO-717)

(10)

Background

Background noise noise

z

UCI requires that the Maximum SPL with Slow time constant complies with NR-30 curve (L

_max,slow

<

NR30) – this includes any source of noise, including passage of trains or aircrafts

z

The Italian Law requires that the noise produced by steady-state equipment (HVAC) has an A-weighted equivalent level less than 35 dB(A) (L

_A,eq

< 35 dBA)

z

The UCI requirements are much more stringent

than the Italian Law

(11)

Vibration

Vibration limits limits

z UCI requires that continuous vibrations are less than the curve 1 of BS-6472 (1992)

z UCI requires also that the vibrations are less than the maximum allowed for building of category 5 in DIN-4150-2

z In practice, the Italian standard UNI-9614

was applied, which specifies a maximum

weighted acceleration level of 71 dB

(12)

Technical

Technical details details

(13)

Technical

Technical details details

(14)

Technical

Technical details details

(15)

Technical

Technical details details

(16)

Vibration

Vibration control control

Neoprene rubber pads

(17)

Preliminary

Preliminary measurements measurements

Punto n. 2

Punto n. 1 Punto n. 3

(18)

Preliminary

Preliminary measurements measurements ( ( vibrations vibrations ) )

Spettro di accelerazione massima - punto n. 1

0.00001 0.0001 0.001 0.01

1 1.25 1.6 2 2.5 3.15 4 5 6.3 8 10 12.5 16 20 25 31.5 40 50 63 80 100

Frequenza (Hz)

Accelerazione (m/s²)

Valori massimi rilevati Soglia di percezione

0.00001 0.0001 0.001 0.01

1 1.25 1.6 2 2.5 3.15 4 5 6.3 8 10 12.5 16 20 25 31.5 40 50 63 80 100

Frequenza (Hz)

Accelerazione (m/s²)

0.00001 0.0001 0.001 0.01

1 1.25 1.6 2 2.5 3.15 4 5 6.3 8 10 12.5 16 20 25 31.5 40 50 63 80 100

Frequenza (Hz)

Accelerazione (m/s²)

Spettro accelerazione massima ponderata

12.9 mm/s²

0.0001 0.001 0.01 0.1

1 1.25 1.6 2 2.5 3.15 4 5 6.3 8 10 12.5 16 20 25 31.5 40 50 63 80 100 Tot

Frequenza (Hz)

Accelerazione ponderata (m/s²)

Valori massimi rilevati Soglia di percezione Limite di accettabilità secondo UNI 9614 - 30 mm/s²

(19)

Realization

(20)

Final

Final verification verification measurements measurements

Isolamento fra sala 12 ed 11 - Dw = 73 dB (indice ISO717 a 500 Hz) - DL = 71 dB(A)

40 45 50 55 60 65 70 75 80 85 90

100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150

Frequenza (Hz)

D (dB)

Divisorio sala 12 - sala 11 Curva ISO-717

Isolamento fra piano inferiore e sala 11 - Dw = 66 dB (indice ISO717 a 500 Hz) - DL = 66 dB(A)

40 45 50 55 60 65 70 75 80 85 90

100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150

Frequenza (Hz)

D (dB)

Divisorio piano inferiore - sala 11 Curva ISO-717

Rumore di calpestio normalizzato - sala 11 - Dnw=22 dB - LAeq = 28.8 dB(A)

0 5 10 15 20 25 30 35 40

100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000

Frequenza (Hz)

Ln (dB)

Rumore di calpestio Curva ISO-717

Verifica curve NR - rumore impianti sala 12

NR-30 NR-35 NR-40

0 10 20 30 40 50 60 70 80

63 125 250 500 1000 2000 4000 8000

Frequenza (Hz)

SPL (dB)

Rumore impianti in ottave Spettro limite NR30 Spettro limite NR35 Spettro limite NR40

(21)

Final

Final verification verification measurements measurements

Profilo Esterno/Interno

0 10 20 30 40 50 60 70 80 90

13:16:19 13:19:12 13:22:05 13:24:58 13:27:50 13:30:43 13:33:36 13:36:29 13:39:22

Ora

SPL (dB-500Hz)

0 10 20 30 40 50 60 70 80 90

20 25 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000 10000 12500 16000 20000

Esterno-treni Interno-treni Interno-fondo

0 10 20 30 40 50 60 70 80

63 125 250 500 1000 2000 4000 8000

Rumore treno in ottave Spettro limite NR30 Spettro limite NR35 Spettro limite NR40 Spettro Isolamento Facciata sala 11 - Dn2m,nT,w = 47 dB

20 25 30 35 40 45 50 55 60

100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000

Frequenza (Hz)

D2m,nT (dB)

Isolamento facciata Curva ISO-717

(22)

Vibration

Vibration measurements measurements

Point n. 1

Point n. 2

(23)

Vibration

Vibration measurements measurements

Point n. 2 - + 20 dB

Point n. 1 - 0 dB

(24)

Vibration

Vibration measurements measurements

Point n. 1 - 0 dB

Point n. 2 - +20 dB

(25)

Vibration

Vibration measurements measurements

Weighted Acceleration Spectrum

20 30 40 50 60 70 80 90

3.15 4 5 6.3 8 10 12.5 16 20 25 31.5 40 50 63 80 TOT

Frequency (Hz)

Law (dB)

Point 1 (max values) Point 2 (max values) Perception Limit

(26)

Conclusions Conclusions

z

Almost all noise and vibrations specifications were fulfilled

z

The rubber support of horizontal structures was able to decouple vibrations above 5 Hz

z

The multilayer walls employing triple gypsum boards gave sound insulation much higher than expected

z